Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 58: Neutrino physics 8

T 58.3: Talk

Wednesday, March 6, 2024, 16:30–16:45, Geb. 30.22: Gaede-HS

First results of the MONUMENT Experiment; ⁷⁶Se partial capture rates — •Elizabeth Mondragon for the MONUMENT collaboration — Chair of Astroparticle Physics, Physics Department, Technical University of Munich, James Franck Str. 85748 Garching, Germany

Extracting particle physics properties from neutrinoless double-beta (0νββ) decay requires a detailed understanding of the involved nuclear structures. Still, modern calculations of the corresponding nuclear matrix elements (NMEs) differ by factors 2-3. The high momentum transfer of Ordinary Muon Capture (OMC) provides insight into highly excited states similar to those that contribute virtually to 0νββ transitions. The precise study of the γ’s following the OMC process makes this a promising tool to validate NME calculations and test the quenching of the axial vector coupling g_A. MONUMENT performs OMC measurements at the Paul Scherrer Institute and is dedicated primarily to 0νββ decay searches. The first results will be presented on the ββ decay daughter isotope ⁷⁶Se, corresponding with the LEGEND experiment’s isotope ⁷⁶Ge. This research was funded by RFBR and DFG, project number 21-52-12040, the DFG Grant 448829699, and by a Department of Energy Grant No DE-SC0019261.

Keywords: 0nbb; OMC; NME; Muon; LEGEND